loongson2_thermal.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Author: zhanghongchen <zhanghongchen@loongson.cn>
  4 *         Yinbo Zhu <zhuyinbo@loongson.cn>
  5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
  6 */
  7
  8#include <linux/interrupt.h>
  9#include <linux/io.h>
 10#include <linux/minmax.h>
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/property.h>
 15#include <linux/thermal.h>
 16#include <linux/units.h>
 17
 18#include "thermal_hwmon.h"
 19
 20#define LOONGSON2_MAX_SENSOR_SEL_NUM	3
 21
 22#define LOONGSON2_THSENS_CTRL_HI_REG	0x0
 23#define LOONGSON2_THSENS_CTRL_LOW_REG	0x8
 24#define LOONGSON2_THSENS_STATUS_REG	0x10
 25#define LOONGSON2_THSENS_OUT_REG	0x14
 26
 27#define LOONGSON2_THSENS_INT_LO		BIT(0)
 28#define LOONGSON2_THSENS_INT_HIGH	BIT(1)
 29#define LOONGSON2_THSENS_INT_EN		(LOONGSON2_THSENS_INT_LO | \
 30					 LOONGSON2_THSENS_INT_HIGH)
 31#define LOONGSON2_THSENS_OUT_MASK	0xFF
 32
 33/*
 34 * This flag is used to indicate the temperature reading
 35 * method of the Loongson-2K2000
 36 */
 37#define LS2K2000_THSENS_OUT_FLAG	BIT(0)
 38
 39struct loongson2_thermal_chip_data {
 40	unsigned int thermal_sensor_sel;
 41	unsigned int flags;
 42};
 43
 44struct loongson2_thermal_data {
 45	void __iomem *ctrl_reg;
 46	void __iomem *temp_reg;
 47	const struct loongson2_thermal_chip_data *chip_data;
 48};
 49
 50static void loongson2_set_ctrl_regs(struct loongson2_thermal_data *data,
 51				    int ctrl_data, bool low, bool enable)
 52{
 53	int reg_ctrl = 0;
 54	int reg_off  = data->chip_data->thermal_sensor_sel * 2;
 55	int ctrl_reg = low ? LOONGSON2_THSENS_CTRL_LOW_REG : LOONGSON2_THSENS_CTRL_HI_REG;
 56
 57	reg_ctrl = ctrl_data + HECTO;
 58	reg_ctrl |= enable ? 0x100 : 0;
 59	writew(reg_ctrl, data->ctrl_reg + ctrl_reg + reg_off);
 60}
 61
 62static int loongson2_thermal_set(struct loongson2_thermal_data *data,
 63				 int low, int high, bool enable)
 64{
 65	/* Set low temperature threshold */
 66	loongson2_set_ctrl_regs(data, clamp(-40, low, high), true, enable);
 67
 68	/* Set high temperature threshold */
 69	loongson2_set_ctrl_regs(data, clamp(125, low, high), false, enable);
 70
 71	return 0;
 72}
 73
 74static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
 75{
 76	int val;
 77	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 78
 79	val = readl(data->ctrl_reg + LOONGSON2_THSENS_OUT_REG);
 80	*temp = ((val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
 81
 82	return 0;
 83}
 84
 85static int loongson2_2k2000_get_temp(struct thermal_zone_device *tz, int *temp)
 86{
 87	int val;
 88	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 89
 90	val = readl(data->temp_reg);
 91	*temp = ((val & 0xffff) * 820 / 0x4000 - 311) * KILO;
 92
 93	return 0;
 94}
 95
 96static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
 97{
 98	struct thermal_zone_device *tzd = dev;
 99	struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
100
101	writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
102
103	thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
104
105	return IRQ_HANDLED;
106}
107
108static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
109{
110	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
111
112	return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
113}
114
115static const struct thermal_zone_device_ops loongson2_2k1000_of_thermal_ops = {
116	.get_temp = loongson2_2k1000_get_temp,
117	.set_trips = loongson2_thermal_set_trips,
118};
119
120static const struct thermal_zone_device_ops loongson2_2k2000_of_thermal_ops = {
121	.get_temp = loongson2_2k2000_get_temp,
122	.set_trips = loongson2_thermal_set_trips,
123};
124
125static int loongson2_thermal_probe(struct platform_device *pdev)
126{
127	const struct thermal_zone_device_ops *thermal_ops;
128	struct device *dev = &pdev->dev;
129	struct loongson2_thermal_data *data;
130	struct thermal_zone_device *tzd;
131	int ret, irq, i;
132
133	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
134	if (!data)
135		return -ENOMEM;
136
137	data->chip_data = device_get_match_data(dev);
138
139	data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
140	if (IS_ERR(data->ctrl_reg))
141		return PTR_ERR(data->ctrl_reg);
142
143	/* The temperature output register is separate for Loongson-2K2000 */
144	if (data->chip_data->flags & LS2K2000_THSENS_OUT_FLAG) {
145		data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
146		if (IS_ERR(data->temp_reg))
147			return PTR_ERR(data->temp_reg);
148
149		thermal_ops = &loongson2_2k2000_of_thermal_ops;
150	} else {
151		thermal_ops = &loongson2_2k1000_of_thermal_ops;
152	}
153
154	irq = platform_get_irq(pdev, 0);
155	if (irq < 0)
156		return irq;
157
158	writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
159
160	loongson2_thermal_set(data, 0, 0, false);
161
162	for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
163		tzd = devm_thermal_of_zone_register(dev, i, data, thermal_ops);
164
165		if (!IS_ERR(tzd))
166			break;
167
168		if (PTR_ERR(tzd) != -ENODEV)
169			continue;
170
171		return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
172	}
173
174	ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
175					IRQF_ONESHOT, "loongson2_thermal", tzd);
176	if (ret < 0)
177		return dev_err_probe(dev, ret, "failed to request alarm irq\n");
178
179	devm_thermal_add_hwmon_sysfs(dev, tzd);
180
181	return 0;
182}
183
184static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
185	.thermal_sensor_sel = 0,
186	.flags = 0,
187};
188
189static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
190	.thermal_sensor_sel = 0,
191	.flags = LS2K2000_THSENS_OUT_FLAG,
192};
193
194static const struct of_device_id of_loongson2_thermal_match[] = {
195	{
196		.compatible = "loongson,ls2k1000-thermal",
197		.data = &loongson2_thermal_ls2k1000_data,
198	},
199	{
200		.compatible = "loongson,ls2k2000-thermal",
201		.data = &loongson2_thermal_ls2k2000_data,
202	},
203	{ /* end */ }
204};
205MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
206
207static struct platform_driver loongson2_thermal_driver = {
208	.driver = {
209		.name		= "loongson2_thermal",
210		.of_match_table = of_loongson2_thermal_match,
211	},
212	.probe	= loongson2_thermal_probe,
213};
214module_platform_driver(loongson2_thermal_driver);
215
216MODULE_DESCRIPTION("Loongson2 thermal driver");
217MODULE_AUTHOR("Loongson Technology Corporation Limited");
218MODULE_LICENSE("GPL");